"Steven Flatt" <[EMAIL PROTECTED]> writes:
> Regarding your other email -- interesting -- but we are vacuuming pg_class
> every hour. So I don't think the answer lies there...
That's good, but is the vacuum actually accomplishing anything? I'm
wondering if there's also a long-running transaction in the mix.
Try a manual "VACUUM VERBOSE pg_class;" after the thing has slowed down,
and see what it says about removable and nonremovable rows.
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match